US3624011A - Cement for nipple junctions of carbon electrodes - Google Patents

Cement for nipple junctions of carbon electrodes Download PDF

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Publication number
US3624011A
US3624011A US62135A US3624011DA US3624011A US 3624011 A US3624011 A US 3624011A US 62135 A US62135 A US 62135A US 3624011D A US3624011D A US 3624011DA US 3624011 A US3624011 A US 3624011A
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US
United States
Prior art keywords
cement
percent
nipple
pitch
mixture
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US62135A
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English (en)
Inventor
Fritz Schipke
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens Plania Werke AG
Original Assignee
Siemens Plania Werke AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens Plania Werke AG filed Critical Siemens Plania Werke AG
Application granted granted Critical
Publication of US3624011A publication Critical patent/US3624011A/en
Anticipated expiration legal-status Critical
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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B7/00—Heating by electric discharge
    • H05B7/02—Details
    • H05B7/14—Arrangements or methods for connecting successive electrode sections
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L61/00—Compositions of condensation polymers of aldehydes or ketones; Compositions of derivatives of such polymers
    • C08L61/02—Condensation polymers of aldehydes or ketones only
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J195/00—Adhesives based on bituminous materials, e.g. asphalt, tar, pitch
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency

Definitions

  • My invention relates to a cement for nipple junctions of carbon electrodes.
  • Another way is to enter cement in the form of pitch, shaped as a pin, into cavities of the nipple.
  • the pitch will drain from cavities and penetrate between the screw threads on the nipple and in the sockets of the electrode parts, thus cementing them together.
  • the strength of a nipple junction secured with the aid of a pitch pin is insufiicient. This particularly applies to temperatures below 400 C. at which cementing with pitch causes no appreciable strengthening of the nipple junction.
  • the nipple-junction cement consists of a mixture of hardenable synthetic resins with pitch, carbon filler material and dextrin, the consistency of the mixture being such as to permit pressing it into the shape of pins.
  • cement mixtures formed of 25 to 60 percent pitch, to 25 percent dextrin, 20 to 30 percent synthetic resin and to 40 percent carbon filler material. (All percentages are by weight). Very good results have been obtained with a cement mixture of 30 to 40 percent pitch, to percent synthetic resin, 10 to 20 percent dextrin and 20 to 30 percent carbon filler material.
  • the pitch used has a melting point (according to Kramer-sarnow) of 120 to 180 C., particularly 140 to 160 C.
  • thermosetting plastic preferably a condensation product having a viscosity of 50 to 500 c.p., preferably a viscosity of 50 to 150 c.p.
  • the carbon filler material of the cement preferably consist of coke dust, particularly in a maximal grain size below 60 micron.
  • the cement mixture according to the invention can be readily fabricated, for example with the aid of an extrusion press, to the shape of a strand that can be cut into pins.
  • These cement pins can be accommodated in corresponding bores or other recesses of the electrode nipples.
  • the cement may also be pressed as a shapeless mass into the nipple bores.
  • the consistency of the cement in such that it remains solid and retains its shape during storage and will not drain from the nipple bores at normal room temperature. Only when the cement is subjected to heating, will it become liquid and then drain out of the nipple bores and fill the interstices between the screw threads of the nipple and the electrode sockets.
  • the cement according to the invention has a virtually unlimited shelf life.
  • the cement further achieves a considerably better adhesive strength within the nipple junction comparison with the pitch pins heretofore known for such purposes.
  • the illustration shows in diametrical section the connection between an upper electrode portion 1 and a lower electrode portion 2.
  • the two portions are joined by a double-conical screw nipple 3 in threaded engagement with the interior screw thread of respective sockets in the butt ends of the electrode portions.
  • the upper and lower portion of the nipple 3 are provided with respective horizontal bores 4 and 5 extending diametrically through the nipple body. Inserted into the bores 4 and 5 are respective pins 6 and 7 consisting of the cement mixture according to the invention.
  • a cement mixture was prepared from 30.5 percent by weight of pitch having a solidification point between and C. and a coke content of 60 percent.
  • the pitch was mixed with 20 percent of a thermosetting condensation resin, 30.5 percent coke dust having a maximum grain diameter of 60 micron, and 13 percent dextrin.
  • This cement mixture was shaped into pins which were inserted into two radial bores fully traversing a nipple and having each a diameter of 9 mm.
  • the nipples thus prepared were employed for joining electrode portions of the dimension Xl50 mm.
  • the nipple junction was then heated to different testing temperatures, and the strength of the nipple junction was measured at different temperatures by attempts to separate the junction by twisting. The following values were thus measured.
  • EXAMPLE 2 A cement mixture was prepared of 35 percent pitch having a solidification point between 160 and 170 C., 30 percent of a thermosetting condensation resin, 20 percent coke dust having a maximal grain size below 60 micron, and 15 percent dextrin. The mixture was more brittle than those according to examples 1 and 2 but exhibited substantially the same properties in the other respects mentioned above.
  • EXAMPLE 4 A cement mixture was prepared of 58 percent pitch having a solidification point between l60and l70 C., 21 percent of a thermosetting condensation resin, 16 percent coke dust, and 5 percent dextrin. The following values of strength were measured in twisting tests made as described in example I: at 200 C.: 16 to 17 mkg, at 300 C: 16 to 17 mkg, at 400 C.: 23 to 25 mkg, at 500 C. more than 50 mkg.
  • a preferred synthetic resin is a furfural-aldehyde polycondensation product prepared in accordance with US. Pat. No. 2,956,040. Any of the resins of said patent are suitable for this invention.
  • a carbonaceous cement for nipple junctions between carbon electrodes consisting essentially of, by weight, a mixture of 20 to 30 percent thermosetting condensation resin, said resin being a furfural-aldehyde polycondensation product having a viscosity of 50 to 500 c.p., 25 to 60 percent pitch having a melting point of to 180 C. (according to Kramer- Samow), 10 to 40 percent carbon filler material and 5 to 25 percent dextrin, said mixture of plastic consistency so as to be pressable to the shape of pins.
  • An electrode nipple cement according to claim 1 consisting essentially of 20 to 30 percent by weight ofsaid resin, 30 to 40 percent pitch, 20 to 30 percent carbon filler material, and 10 to 20 percent dextrin.
  • a cement according to claim 1 wherein said pitch has a melting point (according to Kramer-Sarnow) of to 160 4.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Materials Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Discharge Heating (AREA)
  • Sealing Material Composition (AREA)
  • Adhesives Or Adhesive Processes (AREA)
US62135A 1965-06-30 1970-08-07 Cement for nipple junctions of carbon electrodes Expired - Lifetime US3624011A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DES0097909 1965-06-30

Publications (1)

Publication Number Publication Date
US3624011A true US3624011A (en) 1971-11-30

Family

ID=7521079

Family Applications (1)

Application Number Title Priority Date Filing Date
US62135A Expired - Lifetime US3624011A (en) 1965-06-30 1970-08-07 Cement for nipple junctions of carbon electrodes

Country Status (11)

Country Link
US (1) US3624011A (ar)
AT (1) AT269497B (ar)
BE (1) BE683473A (ar)
CH (1) CH487570A (ar)
DE (1) DE1565076C3 (ar)
ES (1) ES328077A1 (ar)
FI (1) FI45562C (ar)
GB (1) GB1155521A (ar)
NL (1) NL6609150A (ar)
NO (1) NO122491B (ar)
SE (1) SE337636B (ar)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9115816U1 (de) * 1991-12-20 1992-02-13 SGL CARBON AG, 65203 Wiesbaden Masse zur Sicherung einer Schraubverbindung zwischen Kohlenstoff- oder Graphitelektroden
DE10253254B3 (de) 2002-11-15 2004-05-27 Sgl Carbon Ag Elektrodenverbindung mit beschichteten Kontaktflächen

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2884391A (en) * 1959-04-28 Thermosetting cement comprising a
US2956040A (en) * 1956-08-18 1960-10-11 Hoechst Ag Furfural-aldehyde polycondensation products with unsaturated hydrocarbons and process of making

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2884391A (en) * 1959-04-28 Thermosetting cement comprising a
US2956040A (en) * 1956-08-18 1960-10-11 Hoechst Ag Furfural-aldehyde polycondensation products with unsaturated hydrocarbons and process of making

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
Chem. Abstracts, Vol. 55: 20393i, Binder Fuel Briquets, N. V. Briko *
Chem. Abstracts, Vol. 55: 22776i, Ability Prepare Production. (Vieira) *

Also Published As

Publication number Publication date
ES328077A1 (es) 1967-04-01
BE683473A (ar) 1966-12-30
NL6609150A (ar) 1967-01-02
CH487570A (de) 1970-03-15
AT269497B (de) 1969-03-25
DE1565076B2 (de) 1973-03-01
SE337636B (ar) 1971-08-16
DE1565076A1 (de) 1970-01-22
NO122491B (ar) 1971-07-05
FI45562B (ar) 1972-04-04
FI45562C (fi) 1972-07-10
GB1155521A (en) 1969-06-18
DE1565076C3 (de) 1973-09-20

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